Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2019.03.016 |
Expanding networks of field hedges in densely populated landscapes in the Sahel | |
Hiernaux, Pierre1; Adamou, Kalilou2; Moumouni, Oumarou2; Turner, Matthew D.3; Tong, Xiaoye4; Savadogo, Patrice5; Mougin, Eric6; Malam Issa, Oumarou7 | |
2019-05-15 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT
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ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2019 |
卷号 | 440页码:178-188 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Niger; USA; Denmark; Mali |
英文摘要 | Changing woody plant density across agricultural landscapes of the Sudano-Sahelian region is a debated issue. This paper reports the results of an investigation on the contribution of field hedges to overall woody plant density. Hedges separating individual cropped parcels were studied within village agropastoral territories in the Dantiandou district in western Niger. In 1992, field hedges were mapped over the study area using aerial photography and in 2016, using high resolution Google Earth imagery. In 1992, field hedge length was equal to 1006 km within 435 km(2) of croplands, equivalent to 2.3 km km(-2). In 2016, 17.5% of these hedges had disappeared, but 1591 km of new hedges were observed resulting in an increased density of hedges to 5.6 km km(-2). In 24 years, hedges had increased at a mean annual rate of 3.7% likely associated with the splitting of crop fields by inheritance. The composition and productivity of hedges were also monitored in 1996, 2010 and 2015. All trees (maximum height >= 4 m), shrubs (< 4 m) and tussock perennial grasses were recorded within twelve field hedge samples of 200 m each. Field measurements were used to estimate basal area, crown area, foliage mass and wood mass of each woody plant within the sampled hedges. No significant trends were found between 1996 and 2015 in woody plant density, basal area, crown cover, wood and foliage masses across all monitored hedges. However, overall means hide a slight decrease in tree contributions, while shrub contributions first increased and then decreased. They also mask contradictory trends among sites most likely related to different rates of shrub coppicing and tree cutting. The woody species composition of the hedges is poor with an increase of Combretum giutinosum to the detriment of Guiera senegalensis over the study period. Multiplying the hedge sample statistics by the changing lengths of field hedges in the study area provides estimates of the contribution of the hedge woody plants to the woody plant population at a landscape scale. Between 1992 and 2016, field hedges contributed to increases of woody plant density by 3.9%, basal areas by 5.4%, crown cover by 2.7%, leading to 6.1% annual increase in foliage mass and 8.8% increase in wood mass. |
英文关键词 | Agroforestry Hedgerow Land tenure Deforestation Bocage Tropical Africa |
领域 | 气候变化 |
收录类别 | SCI-E ; SSCI |
WOS记录号 | WOS:000464297900018 |
WOS关键词 | WOODY VEGETATION ; SOIL FERTILITY ; WEST-AFRICA ; MILLET ; MANAGEMENT ; DIVERSITY ; TRENDS ; SHRUB ; NIGER |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183216 |
专题 | 气候变化 |
作者单位 | 1.Pastoral Conseil, 30 Chemin Jouanal, F-82160 Caylus, France; 2.GREAD, Niamey, Niger; 3.Univ Wisconsin, Dept Geog, Madison, WI 53706 USA; 4.Univ Copenhagen, Dept Geosci & Nat Resource Management IGN, DK-1350 Copenhagen, Denmark; 5.World Agroforestry Ctr ICRAF, West & Cent Africa Reg Off Sahel Node, BP E5118, Bamako, Mali; 6.UPS, Observ Midi Pyrenees, CNRS, GET,UMR 5563,IRD,CNES, 14 Ave Edouard Belin, F-31400 Toulouse, France; 7.UPEC, USPC, CNRS, IEES Paris,UMR 242,IRD,SU,INRA, 32 Ave H Varagnat, F-93143 Bondy, France |
推荐引用方式 GB/T 7714 | Hiernaux, Pierre,Adamou, Kalilou,Moumouni, Oumarou,et al. Expanding networks of field hedges in densely populated landscapes in the Sahel[J]. FOREST ECOLOGY AND MANAGEMENT,2019,440:178-188. |
APA | Hiernaux, Pierre.,Adamou, Kalilou.,Moumouni, Oumarou.,Turner, Matthew D..,Tong, Xiaoye.,...&Malam Issa, Oumarou.(2019).Expanding networks of field hedges in densely populated landscapes in the Sahel.FOREST ECOLOGY AND MANAGEMENT,440,178-188. |
MLA | Hiernaux, Pierre,et al."Expanding networks of field hedges in densely populated landscapes in the Sahel".FOREST ECOLOGY AND MANAGEMENT 440(2019):178-188. |
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